Outdoor solar panels, cen effectively convert sunlight into electricity. Clean energy, long life span and energy saving. Suitable for pet house, tree house, and RV car, etc. This fan only runs under the sun and how it runs depends on the weather condition. The fan cannot be charged, as it works with USB power on a PC, Laptop, powerful bank. If you want to use this at night, you can use a power bank to run it. Fan Size:4.7*4.7" Power: Solar Panels, not chargeable Solar Panel:10W Only runs under the sun and how it runs depends on the weather condition. The fan cannot be charged, as it works with USB power on Pc, Laptop, Powerful Bank.